:root {
  --primary: #FF6B6B;
  --secondary: #4ECDC4;
  --accent: #FFE66D;
  --bg: #F7FFF7;
  --text: #2F2F2F;
  --white: #FFFFFF;
  --slide-bg: #FFFFFF;
  --shadow: 0 10px 30px rgba(0,0,0,0.1);
  --border-radius: 24px;
  --font-display: 'Fredoka One', cursive, sans-serif;
  --font-body: 'Quicksand', sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 40px 20px;
}

h1, h2, h3 {
  font-family: var(--font-display);
  color: var(--primary);
  line-height: 1.2;
}

/* Slide Container */
.presentation-container {
  width: 100%;
  max-width: 1000px;
  display: flex;
  flex-direction: column;
  gap: 80px;
}

/* Slide Styles */
.slide {
  background: var(--slide-bg);
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  padding: 60px;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: center;
  border: 8px solid var(--secondary);
}

.slide::before {
  content: '';
  position: absolute;
  top: -50px;
  right: -50px;
  width: 200px;
  height: 200px;
  background: var(--accent);
  border-radius: 50%;
  opacity: 0.3;
  z-index: 0;
}

.slide-content {
  position: relative;
  z-index: 1;
}

.slide-title {
  font-size: 3.5rem;
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 2px;
}

.slide-subtitle {
  font-size: 1.8rem;
  color: var(--secondary);
  font-weight: 700;
}

/* Slide Specific Layouts */
.slide-title-page {
  text-align: center;
  align-items: center;
  background: radial-gradient(circle at center, #FFFFFF 0%, #E0F7F6 100%);
}

.slide-title-page .alphabet-float {
  font-family: var(--font-display);
  font-size: 2rem;
  position: absolute;
  color: var(--primary);
  opacity: 0.2;
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0); }
  50% { transform: translateY(-20px) rotate(10deg); }
}

/* List Styles */
.point-list {
  list-style: none;
  font-size: 1.5rem;
}

.point-list li {
  margin-bottom: 15px;
  padding-left: 40px;
  position: relative;
}

.point-list li::before {
  content: '★';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 1.8rem;
}

.sub-points {
  margin-left: 20px;
  font-size: 1.2rem;
  list-style: none;
}

.sub-points li::before {
  content: '•';
  color: var(--secondary);
}

/* Grid for Letters */
.letter-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 15px;
  margin-top: 30px;
}

.letter-card {
  background: var(--bg);
  padding: 15px;
  border-radius: 12px;
  text-align: center;
  border: 2px solid var(--secondary);
  transition: transform 0.2s;
}

.letter-card:hover {
  transform: scale(1.1);
  background: var(--accent);
}

.letter-main {
  font-family: var(--font-display);
  font-size: 2rem;
  display: block;
  color: var(--primary);
}

.letter-word {
  font-size: 0.9rem;
  font-weight: 700;
}

/* Rule Cards */
.rules-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.rule-box {
  background: #f9f9f9;
  padding: 20px;
  border-radius: 15px;
  border-left: 8px solid var(--primary);
}

.rule-box h3 {
  font-size: 1.3rem;
  margin-bottom: 10px;
}

.example {
  background: var(--white);
  padding: 8px 12px;
  border-radius: 8px;
  font-weight: bold;
  display: inline-block;
  margin-top: 5px;
}

.highlight {
  color: var(--primary);
  text-decoration: underline;
}

/* Interactive Slide */
.interactive-challenge {
  background: #2F2F2F;
  color: white;
  padding: 30px;
  border-radius: 15px;
}

.mistake-line {
  font-size: 1.8rem;
  margin-bottom: 15px;
  font-family: monospace;
}

.answer-reveal {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 2px dashed #555;
  color: var(--accent);
}

/* Buttons/Links */
.nav-dots {
  position: fixed;
  right: 40px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 15px;
  z-index: 100;
}

.dot {
  width: 12px;
  height: 12px;
  background: var(--secondary);
  border-radius: 50%;
  text-decoration: none;
  transition: 0.3s;
}

.dot:hover, .dot.active {
  background: var(--primary);
  transform: scale(1.5);
}

/* Footer / Progress */
.slide-footer {
  position: absolute;
  bottom: 20px;
  right: 40px;
  font-weight: bold;
  color: #ccc;
}

/* Visuals */
.placeholder-image.book {
  width: 200px;
  height: 120px;
  background: var(--primary);
  margin: 40px auto 0;
  border-radius: 10px 10px 0 0;
  position: relative;
}

.placeholder-avatar.smiling {
  width: 100px;
  height: 100px;
  background: var(--accent);
  border-radius: 50%;
  margin: 20px auto;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 3rem;
  color: var(--text);
}

@media (max-width: 768px) {
  .slide {
    padding: 30px;
  }
  .slide-title {
    font-size: 2rem;
  }
  .letter-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .rules-container {
    grid-template-columns: 1fr;
  }
}